Kelly Grid is defined as a technique drawn from Personal Construct Psychology devised by Psychologist George Kelly which was used to understand the way in which an individual employs his/her own experience in order to make sense of the world. Kelly Grid also known as a Repertory grid identifies and maps the interactions between the key ideas, themes or constructs that a person uses. These constructs can often be employed to rate or describe brands or organisations in a market research context . This is an individual technique and does not work well in groups .
Kennard principle is defined as principle of neural recovery that bears the name of its originator, Margaret Kennard. Kennard principle holds that earlier brain injury is associated with less impairment and better recovery of functions than injury occurring later in development . Subsequent clinical and experimental studies have not fully supported this principle.